whitney



2 Sheets-Sheet 1.

(No Model.)

A. WHITNEY.

CENTER DRILLING MAG EINE.

Patented Sept. 25, 1888.

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(NQ Model.) 2 sheets-smeet4 2. A. WHITNEY.

n CENTER DEILLING MACHINE.

No. 390,108. Patented Sept. 25, 1888.

N4 PETERS, PhnmLllhagnphr. Washingwn. DAC.

l l` Unirse STATns Aram Frison,

AMOS VHITNEY, OF HARTFORD, CONNECTICUT, ASSIGNOR TO THE PRATT di VHITNEYCOMPANY, OF SAME PLACE.

CENTER-DRILLING MACHINE.

SPECIFICATION forming pari'. of Letters Patent No. 390,108, datedSeptember 25, 1888.

Application tiled July 23, 1888. Serial No. 280,785. (No model.)

To aZZ whom it may concern,.-

Beit known that I, AMos WHITNEY,a citizen of the United States, residingat Hartford, in the county of Hartford and State of Connecticut, haveinvented certain new and useful Improvements in Center-DrillingMachines, of which the following is a specification.

This invention relates to that class of drilling-machines which are usedfor centering 1o Work previous to turning, and which are provided withone spindle to carry a drill and another spindle to carry a reamer, andit is in the nature of an improvement on the drillingmachine describedin United States Patent i5 No. 376,838, granted to me January 24, 1888.

In the drawings accompanying and forming a part of this specification,Figure l is a plan or top View of a center-drilling` machine enihodyingmy improvements. Fig. 2 is a front 2o elevation of the machine. Fig. 3is a crossseetional view of the same in or near line aa, Fig. 2. Fig. 4is a sectional top View of the sliding spindle-head and some of thecontained parts in line b b, Fig. 3. Fig. 5 is an elevation similar toFig. 2, showinga modification ofthe movable head. Fig. 6 is a viewsimilar to Fig. 3 of the same modification.

Similar characters designate like parts in all the gures.

The frame or bed of the machine may have any construction suitable forcarrying the several parts thereof. In the drawingssuch a bed isdesignated in a general way by B and is constructed to carry thelaterally-movable head H, on which the drill-spindles are mounted.

This construction consists or may consist of the ways 38 39 on the bed,engaging with the ways 40 4l on the sliding head, all formed and fittedin a well-known manner. Said head H 4o has bearings 60 and 6l forspindle-sleeves Eand F, respectively; also bearings 62 and 63 for thesleeves of pulleys 34 and 33, respectively, and a vertical bearing forlock-bolt 28. Botation of the sleeves E and F is or may be prevented bykeys (not shown herein) fastin the respective sleeves and sliding inkeyways in head H, as described in my aforesaid patent. The sleeves Eand F are driven by a gear, G, meshing with racks 32 and 31 on sleeves E5o and F, respectively. Gear G is secured to or :formed on the plate orhub 13, and is actuated by the handle 24 of lever Q, which is pivotedbetween lugs on the upper end, 25, of said part 13. Said lever isfurther guided by guide-lugs 51, xed on said part 13 opposite g5 to lugs50. Between these opposite lugs the lever is pivoted at 46 to the head47 of the lock-bolt 28, which head is removably afxed to the upper endof said bolt. A spring, 68, contained within gear G (and under the cap69) 6o and acting on a shoulder on the bolt 28, serves to normally holdsaid bolt down, when the lever is free to be moved.

By means ofthe devices here described the head H may be locked andunlocked by raising and lowering the lever Q, and the sleeves E F may beoperated by swinging said lever in a horizontal plane, (thus turning thegear G,) Whether or not said movable hcad is locked or unlocked, onesaid movement being inde- 7o pendent of the other. For setting the headH in different positions on the ways 38 39, suitable holes, as 42 43,Fig. 3, are made in the bed for receiving the lock-bolt 28, the point ofwhich is usually tapered in a well-known manner.

The sleeves E F constitute sliding bearings for the spindles C D,respectively, and these spindles are splined in the usual manner, to bedriven from and to slide through the pulleys So 34 and 33, respectively.The spindles C D, (driven vthrough said pulleys by belts 56 58,)respectively, are provided with collars 81, and with collar-nuts 48 49,for holding them from longitudinal movement in said sleeves E F.

For holding the pieces to be drilled, a suitable vise, M, is provided,and also an adjustable rest, N, (see Fig. 1,) which parts are hereinshown to be of the same construction as 9o the vise and rest describedin my aforesaid patent; but other kinds of vises and supporting-restsmay be employed.

My present improvements are also applicable to the swinginglaterally-movable head H shown in my said prior patent, as illustratedherein by Figs. 5 and 6. These views will loe understood by reference tothe preceding description and to said patent. According to this plan thebed B has bearings for the shafts roo or pivot-bolt 37,0n which the headH swings.

A stop-plate, 52, is also provided (either attached to or formedintegral with the bed) in which to form the lock-bolt recesses 42 and43.

As shown in the drawings, spindle C has a chuck, 84, for holding thecenter-drill 86, and spindle D has the reamer 85 fixed therein. It isnot material, however, which spindle carries the reamer; and other kindsof boringtools may be substituted for those shown.

In using my improved drilling-machine the piece to be drilled isproperly clamped in the vise and otherwisesupported as required, and thedrilling-tools are suitably affixed in or to the respective spindles.The head H is then locked in one of its positions, as shown, forinstance, in Figs. l and 3, thus bringing the drill 86 in position foruse. The spindles being now revolving, the handle 24 is carried forward,(toward the left hand in Fig. 1,) thereby forcing the spindle C forwardand the drill into the piece held in vise M. On returning the handle toits position in Fig. l the drill is withdrawn and the head H may beunlocked and slid along on ways 38 39 to the forward position, whereinthe reamer 85 is in place for use, and by then moving handle 24 towardthe right hand the spindle D is forced forward in like manner as spindleC.

Having thus described my invention, I claim-- l. rlhe combination, in adrilling-machine, of the laterally-movable head, the two sliding sleevesearryingtwo revolving and sliding spindles, the lock-bolt, and ahand-lever pivotally mounted on said head and connected to a piniongearing with said sleeves and connected to said bolt, whereby the headmay be locked and unlocked and may be moved laterally in the machine,and whereby the spindles are both operated from the same lever,substantiall y as set forth.

2. The combination, in a drilling-machine head, of spindles GD, sleevesEF, gear G, operating said sleeves, a lock bolt, and a lever operatingsaid gear, and having a vertical movement relative thereto for operatingsaid bolt independently of the movement of said sleeves, substantial] yas set forth.

3. The combination, in a drilling-machine of the class specified andwith the laterallymovable spindle-head thereof, of the bed carrying saidhead and having the lock-bolt re cesses, the lever mounted to beoperated horizontally and vertically, a lock-bolt connected to beoperated from the vertical movement of said lever, and a sliding spindleconnected to be operated from the horizontal movement of said lever, oneof said movements being indeA pendent of the other, all substantially asdescribed.

4. The combination, with the head H, mounted to have a lateral movementin the machine, of the sliding sleeve E, carrying the spindle, a disk orplate connected to said sleeve and having the lever Q mounted thereon,the lock-bolt 28, connected to said lever, and the spring normallyholding down said bolt and lever, all substantially as described.

5. The combination, in a drilling-machine, of the bed, the head H,mounted to have a lateral movement thereon, the sliding sleeve orbearing carrying the drill-spindle, the revolving plate 13, mounted onhead H and operatively connected to said spindle by a depending hollowgear, the lock-bolt within said gear, and the lever Q, mounted on saidplate and connected to operate said bolt independently of the rotarymovement of said sleeve, all substantially' as described.

AMOS VHITNEY.

Vitnesses:

FRANois H. RioniARns, (ino. W. DRAKE.

